3L0C

Crystal structure of SCP1 phosphatase D206A mutant with trapped inorganic phosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural and functional analysis of the phosphoryl transfer reaction mediated by the human small C-terminal domain phosphatase, Scp1.

Zhang, M.Liu, J.Kim, Y.Dixon, J.E.Pfaff, S.L.Gill, G.N.Noel, J.P.Zhang, Y.

(2010) Protein Sci 19: 974-986

  • DOI: https://doi.org/10.1002/pro.375
  • Primary Citation of Related Structures:  
    3L0B, 3L0C, 3L0Y

  • PubMed Abstract: 

    Human small C-terminal domain phosphatase 1 (Scp1) modulates the phosphorylation state of the C-terminal domain (CTD) of eukaryotic RNA polymerase II (RNAP II), with preference for phosphorylated Ser5 in the tandem heptad repeats of the CTD. Additionally, Scp1 was identified as a conserved regulator of neuronal stem cell development. Scp1 is a member of haloacid dehalogenase (HAD) superfamily, whose catalysis depends on a Mg(2+) ion and a DXDX(T/V) motif. The first Asp of the motif is identified as the nucleophile that is subject to phosphorylation leading to a phosphoryl-aspartate intermediate. This high-energy mixed anhydride intermediate is subsequently hydrolyzed to regenerate the enzyme. In the present study, we successfully captured the phosphoryl-aspartate intermediate in the crystal structure of a Scp1D206A mutant soaked with para-nitrophenyl phosphate (pNPP), providing strong evidence for the proposed mechanism. Furthermore, steady-state kinetic analysis of a variety of Scp1 mutants revealed the importance of Asp206 in Mg(2+) coordination mediated by a water molecule. Overall, we captured the snapshots of the phosphoryl transfer reaction at each stage of Scp1-mediated catalysis. Through structural-based sequence alignment, we show that the spatial position of the D206 side chain is strictly conserved throughout HAD family. Our results strongly suggest that Asp206 and its equivalent residues in other HAD family members play important structural and possible mechanistic roles.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carboxy-terminal domain RNA polymerase II polypeptide A small phosphatase 1
A, B
184Homo sapiensMutation(s): 1 
Gene Names: CTDSP1NIF3NLIIFSCP1
EC: 3.1.3.16
UniProt & NIH Common Fund Data Resources
Find proteins for Q9GZU7 (Homo sapiens)
Explore Q9GZU7 
Go to UniProtKB:  Q9GZU7
PHAROS:  Q9GZU7
GTEx:  ENSG00000144579 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9GZU7
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.508α = 90
b = 77.256β = 112.52
c = 63.116γ = 90
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-03-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-10-13
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-09-06
    Changes: Data collection, Refinement description